Comparison of water isotope-ratio determinations using two cavity ring-down instruments and classical mass spectrometry in continuous ice-core analysis

2013 ◽  
Vol 49 (3) ◽  
pp. 387-398 ◽  
Author(s):  
Olivia J. Maselli ◽  
Diedrich Fritzsche ◽  
Lawrence Layman ◽  
Joseph R. McConnell ◽  
Hanno Meyer
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Ice Core ◽  
Core Analysis ◽  
Water Isotope ◽  
Cavity Ring Down

Direct Comparison of Cavity Ring Down Spectrometry and Isotope Ratio Mass Spectrometry for Detection of Sugar Adulteration in Honey Samples

2018 ◽  
Vol 101 (6) ◽  
pp. 1857-1863 ◽  
Author(s):  
Madhavi Mantha ◽  
John R Urban ◽  
William A Mark ◽  
Anatoly Chernyshev ◽  
Kevin M Kubachka
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Low Cost ◽  
Isotope Ratio Mass Spectrometry ◽  
Cane Sugar ◽  
Technical Knowledge ◽  
Scientific Methods ◽  
High Fructose ◽  
Honey Analysis ◽  
Cavity Ring Down

Abstract In the last several years, economically motivated adulteration (EMA) of foods including honey has received increased attention. The addition of inexpensive sweeteners such as high fructose corn syrup or cane sugar to honey is still encountered despite scientific methods that can routinely detect this type of adulteration. The standard method for detection of these adulterants utilizes isotope ratio mass spectrometry (IRMS); however, this technique requires an elevated degree of technical knowledge for operation as well as a high cost for purchase and maintenance. Cavity ring down spectroscopy (CRDS) has demonstrated potential for this type of analysis and is less expensive with simpler operation. This study evaluates CRDS for the detection of low-cost sweeteners added to honey and compares the performance of CRDS to IRMS. Several honey samples were analyzed, and the advantages and limitations specific to CRDS were evaluated. Overall, the results indicate that CRDS provides a performance comparable to the benchmark technique IRMS for EMA honey analysis.

scholarly journals Tree xylem water isotope analysis by Isotope Ratio Mass Spectrometry and laser spectrometry: A dataset to explore tree response to drought

Data in Brief ◽  
2020 ◽  
Vol 29 ◽  
pp. 105349
Author(s):  
Simon Damien Carrière ◽  
Nicolas K. Martin-StPaul ◽  
Coffi Belmys Cakpo ◽  
Nicolas Patris ◽  
Marina Gillon ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Isotope Analysis ◽  
Isotope Ratio Mass Spectrometry ◽  
Laser Spectrometry ◽  
Water Isotope

scholarly journals Measuring stable isotopes of hydrogen and oxygen in ice by means of laser spectrometry: the Bølling transition in the Dye-3 (south Greenland) ice core

2002 ◽  
Vol 35 ◽  
pp. 125-130 ◽  
Author(s):  
Radboud van Trigt ◽  
Harro A. J. Meijer ◽  
Arny E. Sveinbjörnsdóttir ◽  
Sigfús J. Johnsen ◽  
Erik R.Th. Kerstel
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Ice Core ◽  
Isotope Ratio Mass Spectrometry ◽  
Direct Absorption ◽  
Deuterium Excess ◽  
Laser Spectrometry ◽  
O Isotope ◽  
A New Technique ◽  
Better Than

AbstractWe report on the first application of a new technique in ice-core research, based on direct absorption infrared laser spectrometry (LS), for measuring 2H, 17Oand 18O isotope ratios. the data are used to calculate the deuterium excess d (defined as δ2H– 8δ18O) for a section of the Dye-3 (south Greenland) deep ice core around the Bølling transition (14 500 BP). the precision of LS is slightly better than that of most traditional methods for deuterium, but not for the oxygen isotopes. the ability to measure δ17O is new and is used here to improve the precision of the δ18O determination. Still, the final precision for δ18O remains inferior to traditional isotope ratio mass spectrometry (IRMS). Therefore, deuterium excess was calculated from a combination of the LS and IRMS isotope determinations.

scholarly journals Economically Motivated Adulteration of Lemon Juice: Cavity Ring Down Spectroscopy in Comparison with Isotope Ratio Mass Spectrometry: Round-Robin Study

2019 ◽  
Vol 102 (5) ◽  
pp. 1544-1551
Author(s):  
Madhavi Mantha ◽  
Kevin M Kubachka ◽  
John R Urban ◽  
Catherine O Dasenbrock ◽  
Anatoly Chernyshev ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Citric Acid ◽  
Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
The United States ◽  
Round Robin ◽  
Lemon Juice ◽  
Viable Option ◽  
Laboratory Exercise ◽  
Cavity Ring Down

Abstract Background: Economically motivated adulteration (EMA) of foods has become an increasing concern in recent years, with lemon juice as a popular target. Objective and Method: In this work, an optimized preparation procedure for the isolation of citric acid from lemon juice was validated using elemental analyzer-isotope ratio MS (EA-IRMS) to detect adulteration with exogenous citric acid. Additionally, 69 imported lemon juice samples were evaluated using combustion module-cavity ring down spectrometry (CM-CRDS) and compared with the well-established EA-IRMS. Equivalency of CM-CRDS to EA-IRMS was further demonstrated by conducting a round-robin study involving eight laboratories throughout the United States, Canada, and New Zealand. Results: Overall, the results obtained for CM-CRDS were statistically indistinguishable from the results obtained using EA-IRMS for EMA lemon juice analysis. Conclusions: Therefore, CM-CRDS is a viable option for this application. Highlights: The CM-CRDS instrumentation is easy to operate, robust, and provides δ13C values comparable to EA-IRMS for citrate analysis. Through a multi-laboratory exercise, CM-CRDS was shown to be an alternative to EA-IRMS in the detection of economic adulteration of lemon juice.

The microclimate of Mawson's Hut based on snow and ice core analysis

Polar Record ◽  
2012 ◽  
Vol 50 (1) ◽  
pp. 37-42
Author(s):  
Shavawn Donoghue ◽  
Tim H. Jacka ◽  
Vin Morgan ◽  
Estelle Lazer
Keyword(s):  
Structural Analysis ◽  
Oxygen Isotope ◽  
Isotope Ratio ◽  
Ice Core ◽  
Isotope Analysis ◽  
Core Analysis ◽  
Oxygen Isotope Ratio ◽  
Katabatic Winds ◽  
Isotope Data ◽  
Snow Samples

ABSTRACTWe report the oxygen isotope ratio (δ18O) and structural analysis of four 2m long firn cores collected in 1997 from inside Mawson's Hut (consisting of a Main Hut and a Workshop), Commonwealth Bay, Antarctica, and 25 snow samples collected in 2001 in the vicinity of the huts. Our aim is to examine the microclimate within the huts. Structural analyses of the cores and snow samples indicate there were no significant melt and refreeze events, however there is evidence of water seepage into the huts from the roof. Oxygen isotope data from the two cores from the Main Hut indicate that the hut filled slowly after being abandoned in 1914. Two cores adjacent to the Workshop suggest comparatively rapid snow filling after it was cleared of snow in 1978. Oxygen isotope analysis of individual samples collected outside Mawson's Hut suggests snow, accumulated south of Cape Denison, is deposited by katabatic winds.

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